A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887
Article
Article Title | A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887 |
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ERA Journal ID | 17478 |
Article Category | Article |
Authors | Jeffers, S. V. (Author), Dreizler, S. (Author), Barnes, J. R. (Author), Haswell, C. A. (Author), Nelson, R. P. (Author), Rodriguez, E. (Author), Lopez-Gonzalez, M. J. (Author), Morales, N. (Author), Luque, R. (Author), Zechmeister, M. (Author), Vogt, S. S. (Author), Jenkins, J. S. (Author), Palle, E. (Author), Berdi nas, Z. M. (Author), Coleman, G. A. L. (Author), Diaz, M. R. (Author), Ribas, I. (Author), Jones, H. R. A. (Author), Butler, R. P. (Author), Tinney, C. G. (Author), Bailey, J. (Author), Carter, B. D. (Author), O'Toole, S. (Author), Wittenmyer, R. A. (Author), Crane, J. D. (Author), Feng, F. (Author), Shectman, S. A. (Author), Teske, J. (Author), Reiners, A. (Author), Amado, P. J. (Author) and Anglada-Escude, G. (Author) |
Journal Title | Science |
Journal Citation | 368 (6498), pp. 1477-1481 |
Number of Pages | 5 |
Year | 2020 |
Publisher | American Association for the Advancement of Science (AAAS) |
Place of Publication | United States |
ISSN | 0036-8075 |
0096-3771 | |
1095-9203 | |
Digital Object Identifier (DOI) | https://doi.org/10.1126/science.aaz0795 |
Web Address (URL) | https://science.sciencemag.org/content/368/6498/1477 |
Abstract | The closet exoplanets to the Sun provide opportunities for detailed characterization of planets outside the Solar System. We report the discovery, using radial velocity measurements, of a compact multiplanet system of super-Earth exoplanets orbiting the nearby red dwarf star GJ 887. The two planets have orbital periods of 9.3 and 21.8 days. Assuming an Earth-like albedo, the equilibrium temperature of the 21.8-day planet is ~350 kelvin. The planets are interior to, but close to the inner edge of, the liquid-water habitable zone. We also detect an unconfirmed signal with a period of ~50 days, which could correspond to a third super-Earth in a more temperate orbit. Our observations show that GJ 887 has photometric variability below 500 parts per million, which is unusually quiet for a red dwarf. |
Keywords | Astronomy; Planet SCI; Astrophysics - Earth and Planetary; Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Georg August University of Gottingen, Germany |
Open University, United Kingdom | |
University of La Laguna, Spain | |
Spanish National Research Council, Spain | |
Institute of Astrophysics of Andalusia, Spain | |
University of California, United States | |
University of Chile, Chile | |
Institute of Astrophysics of the Canary Islands, Spain | |
Queen Mary University of London, United Kingdom | |
Institute of Space Sciences, Spain | |
University of Hertfordshire, United Kingdom | |
Carnegie Institution of Washington, United States | |
University of New South Wales | |
Centre for Astrophysics | |
Macquarie University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q62y7/a-multiplanet-system-of-super-earths-orbiting-the-brightest-red-dwarf-star-gj-887
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